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accesslevel.go
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/
accesslevel.go
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// Copyright 2018-2020 opcua authors. All rights reserved.
// Use of this source code is governed by a MIT-style license that can be
// found in the LICENSE file.
package main
import (
"context"
"flag"
"log"
"github.com/mvandergrift/opcua"
"github.com/mvandergrift/opcua/debug"
"github.com/mvandergrift/opcua/ua"
)
func main() {
var (
endpoint = flag.String("endpoint", "opc.tcp://localhost:4840", "OPC UA Endpoint URL")
nodeID = flag.String("node", "", "NodeID to read")
)
flag.BoolVar(&debug.Enable, "debug", false, "enable debug logging")
flag.Parse()
log.SetFlags(0)
ctx := context.Background()
c, err := opcua.NewClient(*endpoint)
if err != nil {
log.Fatal(err)
}
if err := c.Connect(ctx); err != nil {
log.Fatal(err)
}
defer c.Close(ctx)
id, err := ua.ParseNodeID(*nodeID)
if err != nil {
log.Fatal(err)
}
n := c.Node(id)
accessLevel, err := n.AccessLevel(ctx)
if err != nil {
log.Fatal(err)
}
log.Print("AccessLevel: ", accessLevel)
userAccessLevel, err := n.UserAccessLevel(ctx)
if err != nil {
log.Fatal(err)
}
log.Print("UserAccessLevel: ", userAccessLevel)
v, err := n.Value(ctx)
switch {
case err != nil:
log.Fatal(err)
case v == nil:
log.Print("v == nil")
default:
log.Print(v.Value())
}
}